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J.J. Thompson discovered that cathode rays were made up of electrons, and determined the mass-to-charge ratio of the electrons. He found that the mass-to-charge ratio of the cathode rays was much smaller than that of hydrogen, and concluded that constituent particles (electrons) must be the building blocks of atoms. He modeled the neutral atom as a sphere of negatively charged electrons distributed amongst positively charged protons. This is known as the "plum pudding" model or the Thompson model of the electron.


Ernest Rutherford proved that the Thompson model was incorrect when he discovered that gold atoms consist of an outside layer of electrons, with a center nucleus densely packed with protons.

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14y ago
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13y ago

the electron was discovered be J.J. Thomson identifying the negative charge by using cathode rays and Robert Millikan found the mass of it which is 9.10938215(45)×10−31.

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England, 1896: Joseph John Thomson, John Townsend, Harold Albert Wilson

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Robert Millikan

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JJ Thompson (cathode ray tube)

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J. J. Thomson in 1897

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Millikan

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milikan

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John Dalton

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Q: Who calculated the mass of an electron?
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Related questions

Is difference of mass number is calculated by electron microscope?

no, the mass spectrometer.


What is the mass of 1 electron?

1/1836 of an electron is the mass of an electron. It is so small they aren't even calculated in the Atomic Mass of an element


What is a protons mass calculated by?

They are calculated by atomic mass units (amu) proton-1amu neutron-1amu electron-0amu


When is the mass of an electron regarded as zero?

The mass of an electron is regarded as zero when it is at rest. The mass of an electron or any particle is calculated by using its momentum and its energy. The mass of an electron is related to its momentum which is zero when the electron is not moving. So when the electron is at rest its momentum is zero and thus its mass is zero. When an electron is moving its mass is no longer zero as its momentum is not zero. It is calculated by using the following equation: Mass = Energy / (Speed of Light)2The mass of an electron increases as its energy increases and it increases even more when it is moving at a higher speed. So when the electron is at rest and its momentum is zero its mass is also zero.


Why is mass number calculated with only the protons and neutrons and not electrons?

Because the mass of electron is negligible when compared to the mass of protons or neutrons.


How is mass of an electron calculated?

IF im correct it is the GCD (greatest common divisor) from our set of data


Is an electron a standing wave?

No -- an electron is a point particle with mass, charge, and spin. The probability that you will find an electron at a specific point can, however, often be calculated by wave functions. Any moving mass can be considered either a particle or a wave. Its properties can be defined via the deBorlie wave equation.


What does the atomic mass of an electron represent?

The mass of an electron is atomic mass units is 5,485 799 090 70(16); the mass of the electron is not an atomic mass.


What is an electron's atomic mass number?

The electron has no atomic mass number. The mass of an electron is roughly 1/1800 of the mass of a proton or neutron.


Who has the smallest mass electrons protons or neutrons?

Of the neutron, proton, and electron, the electron has the smallest mass.


The rest mass energy of an electron positron pair is?

Twice the mass of the electron, since the positron has the same mass of the electron. Or the equivalent, in energy units.An electron has a mass or energy of 511 keV.


What is the mass of of an electron?

Electron has a mass of about 9.10938215 × 10−31 kg.